Tesher,

 

For every pregnancy, there are four possible ways that the genes can combine to produce a given trait (2 parents x 2 genes each).  From your post, it sounds like you actually HAVE CAH? If so, then:

• If your partner is a Carrier (one normal gene, one abnormal gene):  There is a 2 in 4 chance (50%) that the baby will have CAH; also, a 2 in 4 (50%) chance that the child will be a carrier.  No chance that the child will be completely unaffected.
• If your partner is unaffected (two normal genes):  There is a 4 in 4 (100%) chance that the baby will be a carrier.  No chance that the child will have CAH, and no chance that he/she will be completely unaffected.
• If your partner also has CAH (two abnormal genes):  There is a 4 in 4 (100%) chance that the baby will have CAH.  No chance that the child will only be a carrier, and no chance that the child will be completely unaffected.

I think your doctor is probably referring to the carrier frequency in the general population with that "1 in 100" number.  That would be the chance that your partner happens to be a carrier of the CAH gene, thereby increasing your chances of having a child with CAH. 

 

If you are planning to have children and have a partner in mind, it would probably be a good idea to get him tested, so you know what you are dealing with ahead of time.  Good luck.